US2008213868A1PendingUtilityA1

Concentrated aqueous suspensions of microalgae

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Assignee: RIVALPriority: Nov 7, 2002Filed: May 8, 2008Published: Sep 4, 2008
Est. expiryNov 7, 2022(expired)· nominal 20-yr term from priority
Inventors:Real Fournier
C12P 7/6463C12M 47/02C12N 1/02C12N 1/12
30
PatentIndex Score
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Claims

Abstract

The invention relates to a method and apparatus for concentrating an aqueous suspension of microalgae. The suspension of microalgae is passed through a tangential filtering device for partially removing water from the suspension without rupturing the microalgae, thereby obtaining a concentrated suspension of microalgae and filtered water. Such a method can be use in systems for production of microalgae. An apparatus for carrying out the method according to the invention is also disclosed.

Claims

exact text as granted — not AI-modified
1 . An isolated concentrated aqueous suspension of microalgae having a concentration of 1×10 9  to 1×10 10  cells/mL, wherein said microalgae are alive and unruptured, and wherein said isolated concentrated aqueous suspension of microalgae has a nutritive value which is similar to a nutritive value of a fresh culture of microalgae. 
     
     
         2 . An isolated concentrated aqueous suspension of microalgae according to  claim 1 , wherein said isolated concentrated aqueous suspension of microalgae has a concentration of 1.5×10 9  to 8×10 9  cells/mL. 
     
     
         3 . An isolated concentrated aqueous suspension of microalgae according to  claim 1 , wherein said isolated concentrated aqueous suspension of microalgae has a concentration of 5×10 9  to 8×10 9  cells/mL. 
     
     
         4 . An isolated concentrated aqueous suspension of microalgae according to  claim 3 , wherein the nutritive value of said microalgae in said suspension is maintained for a period of at least 12 days. 
     
     
         5 . An isolated concentrated aqueous suspension of microalgae according to  claim 1 , wherein the nutritive value of said microalgae in said suspension is maintained for a period of at least 12 days. 
     
     
         6 . An isolated concentrated aqueous suspension of microalgae according to  claim 1 , wherein the nutritive value of said microalgae in said suspension is maintained for a period of at least 15 days. 
     
     
         7 . An isolated concentrated aqueous suspension of microalgae according to  claim 1 , wherein the nutritive value of said microalgae in said suspension is maintained for a period of at least 30 days. 
     
     
         8 . An isolated concentrated aqueous suspension of microalgae according to  claim 1 , wherein said microalgae are marine microalgae. 
     
     
         9 . An isolated concentrated aqueous suspension of microalgae according to  claim 1 , wherein said microalgae are freshwater microalgae. 
     
     
         10 . An isolated concentrated aqueous suspension of microalgae according to  claim 1 , wherein said microalgae are selected from the group consisting of non-motile unicellular algae, flagellates, diatoms and blue-green algae. 
     
     
         11 . An isolated concentrated aqueous suspension of microalgae according to  claim 1 , wherein said microalgae belong to the family of Chlorophyceae, Prasinophyceae, Bacillariophyceae, Cryptophyceae, Chrysophycea, Haptophyceae or Cyanophyceae. 
     
     
         12 . An isolated concentrated aqueous suspension of microalgae according to  claim 3 , wherein said microalgae belong to a species selected from the group consisting of  Isochrysis galbana, Monochrysis lutheri, Chaetoceros muelleri  and  Nannochloropsis  sp. 
     
     
         13 . An isolated concentrated aqueous suspension of microalgae according to  claim 3 , wherein said microalgae belong to a species selected from the group consisting of  Isochrysis galbana  and  Chaetoceros muelleri.    
     
     
         14 . An isolated concentrated aqueous suspension of microalgae having a concentration of 1×10 9  to 1×10 10  cells/mL, wherein said microalgae are alive and unruptured, and wherein said microalgae have a reproductive potential similar to a reproductive potential of microalgae from a fresh culture. 
     
     
         15 . An isolated concentrated aqueous suspension of microalgae according to  claim 14 , wherein said isolated concentrated aqueous suspension of microalgae has a concentration of 1.5×10 9  to 8×10 9  cells/mL. 
     
     
         16 . An isolated concentrated aqueous suspension of microalgae according to  claim 14 , wherein said isolated concentrated aqueous suspension of microalgae has a concentration of 5×10 9  to 8×10 9  cells/mL. 
     
     
         17 . An isolated concentrated aqueous suspension of microalgae according to  claim 16 , wherein said reproductive potential is maintained for a period of at least 12 days. 
     
     
         18 . An isolated concentrated aqueous suspension of microalgae according to  claim 14 , wherein said reproductive potential is maintained for a period of at least 12 days. 
     
     
         19 . An isolated concentrated aqueous suspension of microalgae according to  claim 14 , wherein said reproductive potential is maintained for a period of at least 25 days. 
     
     
         20 . An isolated concentrated aqueous suspension of microalgae according to  claim 14 , wherein said reproductive potential is maintained for a period of at least 30 days

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